Raw testdata

[eva0marques]

We fixed the pull request problem and I've finally pulled my create_testdata.R in tests/testdata folder. I just wanted to mention that the vignette "tests/testdata/generate_raw_testdata.Rmd" creates and stores all the raw testdata in the tests/testdata/raw/ folder. I have that folder locally but I did not push it remotely because it might be massive. So the testdata/ folder is for now not really clean, with a lot of files created separately. I suppose that in the future we might want to have only testdata files created through these homogeous functions?

[eva0marques]

The testdata for each covariate is stored in files with same names as original raw files.